JPS63300603A - Power distributer/synthesizer - Google Patents

Abstract

PURPOSE:To attain broad band in the operating frequency band by providing a cylindrical cavity resonator for each input/output terminal and adopting a dual tuning circuit passing through two cylindrical cavity resonators to any input/output without fail. CONSTITUTION:Input/output terminals 2, 3 are coupled to independent cylindrical cavity resonators 4, 5 and placed at the center. Moreover, the dual tuning circuit passing through the two cylindrical cacity resonators 4, 5 without fail from the input terminal to the output terminal 3 is constituted. Thus, the cylindrical cavity resonator 4 provided with a common terminal for distribution/synthesizer is selected to have a large diameter, the cylindrical cavity resonator 5 for the outer terminal is formed to be small in the diameter and coupled with other cylindrical cavity resonator 5 within the large diameter of the cylindrical cavity resonator 4 and arranged therearound. Thus, the coupling to any of the input/ output terminals is maximized, the high frequency performance at load is minimized and the frequency band is maximized.

Description

[Detailed Description of the Invention] [Summary] The present invention is a high frequency cylindrical cavity resonator type power divider/synthesizer,
One cylindrical cavity resonator is provided for each input/output terminal, creating a double-tuned circuit configuration that always passes through two cylindrical cavity resonators between any input and output terminals. It aims at widening the band, contributing to improved productivity, wider band of equipment, etc.

[Industrial application field]

The present invention relates to a high frequency cylindrical cavity resonator type power divider/synthesizer, and more particularly, to a power divider/synthesizer capable of widening the usable frequency band.

Wireless communication methods have been put into practical use even in the microwave and millimeter wave frequency bands, and depending on the application, high output power transmission is required.
Conventionally, this depended on traveling wave tubes, etc.

However, in order to make the system more reliable and have a longer service life, there is a strong demand for replacing it with solid parts such as semiconductor parts.

In order to realize this all-solid-state high-output amplifier, the current state of the art is to use multiple small-output unit amplifiers made of solid-state components.
The power divider/synthesizer, which is the key point in input/output distribution/synthesis, is required to have low loss first.

[Conventional technology]

FIG. 2 is a perspective view of a conventional example of a cylindrical cavity resonator type power combiner, FIG.

Low-loss power dividers/synthesizers include non-resonator types that use three-dimensional circuits such as waveguides, and the most common examples are magic T branch circuits and waveguide-type 3dB hybrids, but both When the outputs of a large number (4, 8, 16, etc.) of unit amplifiers are combined, the circuit size becomes large, which is inconvenient in practice.

In addition, if configured as a resonator type, the number of distribution/synthesis is 8 to 16.
Even if the size of the solid-state circuit becomes smaller, the circuit scale remains almost the same, making it possible to realize a compact solid-state circuit device. However, since a resonator is used, the frequency band is narrow.

As an example of improving this, a cylindrical cavity resonator type power combiner 11 with eight combinations in the 14 GHz band is shown in FIG.
A method has been adopted in which two cylindrical cavity resonators (4L5) are combined to form a double-tuned circuit, and the band is widened each time.

The cylindrical cavity resonators 4L5) are stacked one on top of the other and are electrically coupled, and are provided with eight input terminals 21 arranged at equal circular intervals on the bottom surface of the cylindrical cavity resonators 5) in the upper layer. An output terminal 31 is provided at the center of the upper surface of the cylindrical cavity resonator 41.

[The problem that the invention attempts to solve]

However, the coupling to the cylindrical cavity resonator 5)
Each of the input terminals 21 cannot be provided at a position where the coupling is maximized, and as a result, there is a problem in that the frequency band is limited. That is, Fig. 3 (a
) is given by the following equation.

Qo: Q at no load, K: Wave number (2π/λ0, λO is free space wavelength) η: Vacuum wave impedance, Zo: Characteristic impedance, h: Cylindrical cavity height, r: Cylindrical cavity radius, ρ ; Terminal position, Jo, Jl ; 0th and 1st order heso cell functions, χon (
n-■, 2. ); If we calculate β using the nth root of the 0th order Bessel function (n corresponds to n of the TMono mode, which is the resonance mode of the cylindrical cavity) and the ρ of the 0 equation as a variable, we get Figure 3 ( The coupling coefficient characteristics of the cylindrical cavity of bl are as follows.

Here, the coupling reaches its maximum value when ρ-0, that is, at the center position of the cylindrical cavity.

However, in the conventional example described above, a plurality of terminals are not provided at the center position, but must be provided at the circumference of the second and subsequent maximum positions, and therefore the strongest connection cannot be achieved.

On the other hand, the frequency band BW is given by the following equation.

BW-αFO/QL・・・・・・・・・・・・・・・
......■α; How many dB drop band should be defined?
, a constant determined from Fo; center frequency;

Also, the relationship between Q and β is given by the following equation (2).

QL = Qo / (1+β) ・・・・・・・・・・・・
...■From this, in order to minimize QL, β must be maximized.

Therefore, in the conventional structure described above, the maximum frequency band BW
It is concluded that this is not possible.

The above is a case where the input/output terminals of the cylindrical cavity resonator perform magnetic field coupling, or when this terminal coupling is performed by electric field coupling, the electric field coupling coefficient β is given by the following equation.

G: Insertion length of connecting rod
; has the same form as the magnetic field coupling coefficient β described in j, so r, the third
It is similar to the β characteristic diagram in figure (bl), and the maximum value of β′ is also ρ
−0, that is, the center position of the cylindrical cavity, and the frequency band BW
Even if the input/output terminals are electrically coupled, the same discussion can be made as in the case of magnetic coupling, and the conventional structure still causes problems.

SUMMARY OF THE INVENTION The present invention addresses these problems and aims to provide a power cut-off power distribution/combination cover that is of a cavity resonance type, maximizes the frequency band, and has low propagation loss.

[Means for solving problems]

The above problem is as shown in FIG.
.
This problem is solved by the power divider/synthesizer 1 of the present invention, which always passes through two cylindrical cavity resonators 4 and 5 from the input terminal 2 to the output terminal 3, forming a double-tuned circuit configuration.

[Function] That is, since each input/output terminal has maximum coupling with the cylindrical cavity resonator and constitutes a double-tuned circuit configuration, the band can also be maximized.

All the input and output terminals t2, 3 are coupled to one independent cylindrical cavity resonator 4, 5, and are centrally located.

Furthermore, in order to create a double-tuned circuit configuration that always passes through two cylindrical cavity resonators 4 and 5 from the input terminal 2 to the output terminal 3, a cylindrical cavity resonator is provided with a terminal for a common portion of distribution/synthesis. The cylindrical cavity resonator 5 for the other terminals is of a small diameter, and is coupled with another cylindrical cavity resonator 5 within the large diameter of the cylindrical cavity resonator 4. There is a structure C.

Therefore, any input/output terminals 2 and 3 have their combination (β or β
') is maximized, therefore QL is minimized, and frequency band BW is maximized.

(Thus, the frequency band used by the cavity resonator type power distributor/synthesizer can be expanded, improving productivity.

It can contribute to widening the bandwidth of the device.

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings.

The same reference numerals indicate the same objects throughout the figures.

FIG. 1(a) is a perspective view of an embodiment of the present invention, and FIG. 1(b) is a perspective view of an embodiment of the present invention.
A cross-sectional view of the same is shown.

The embodiment is a cylindrical cavity resonator type power combiner 1 of 14 Gtlz band and powered by eight people, as in the conventional example described above.

The eight input terminals 2 are provided at the center of each small-diameter cylindrical cavity resonator 5, and the output terminal 3 is provided at the center of the large-diameter cylindrical cavity 4 by electric field coupling.

On one side of the large diameter of the cylindrical cavity resonator 4, eight cylindrical cavity resonators 5 are disposed in a circular shape and in close contact with each other, and a coupling rod 6 is provided at a predetermined position passing through the mutual contact surface. , magnetic field coupling is established between the resonators.

Thus, from any input terminal 2 to the output terminal 3, two resonators, cylindrical cavity resonator 5 and cylindrical cavity resonator 4, are passed through, forming a double-tuned circuit configuration.

In this embodiment, the frequency band is approximately twice as wide as that of the conventional example described above.

Although the above embodiment shows the power combiner 1, it is completely the same in the case of the distributor, except that the propagation direction is reversed.

Further, the coupling between the input/output terminals 2 and 3 to the cylindrical cavity resonators 4 and 5 and the coupling between the cylindrical cavity resonators 4 and 5 may be achieved by using either electric field coupling or magnetic field coupling. Combinations are also possible and are selected depending on the purpose and dimensions.

Further, although the cylindrical cavity resonator 5 for the input terminal 2 is disposed only on one side of the large diameter cylindrical cavity resonator 4 for the output terminal 3, the cylindrical cavity resonator 5 for the input terminal 2 may be disposed on both sides. .

Of course, the frequency band used and the number of distribution/synthesizing circuits are not limited to the above.

〔Effect of the invention〕

As described above, by using the structure of the cylindrical cavity resonator type power distributor/synthesizer of the present invention, it is theoretically up to 2.5 times that of the conventional example (however, the cylindrical cavity resonator type power distributor/synthesizer is 4.5 times (If the coupling is ideal), it becomes possible to widen the band.

This makes it possible to expand the tolerance for manufacturing precision errors, stabilize temperature characteristics, widen the band of the circuit device, etc., and has great effects.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the present invention, FIG. 2 is a perspective view of a conventional example of a cylindrical cavity resonator type power combiner, and FIG. 3 is a diagram showing the terminal positions of the cylindrical cavity and the connected state. In the figure, ■, 11 is a cylindrical cavity resonant power divider/synthesizer, 2.21
is an input terminal, 3.31 is an output terminal, 4.5, 4L5) is a cylindrical cavity resonator, and 6 is a coupling rod.

Claims (1)

[Claims] In a high frequency cylindrical cavity resonator type power distribution/synthesizer, one cylindrical cavity resonator (4) (5) is connected to each input/output terminal (2) (3). and the relevant input/output terminals (
2) and (3) are electrically coupled or magnetically coupled at the center positions of the cylindrical cavity resonators (4) and (5), and from the input terminal (2) to the output terminal (3),
A power distribution/synthesizer characterized in that power always passes through the two cylindrical cavity resonators (4) and (5) to form a double-tuned circuit configuration.